basic guide to magnetic drills & annular cutters
TRANSCRIPT
How to use a Magnetic Drill with Annular Cutters, what to look for, best practices and tips to extend tool life
& achieve the best performance
BASIC GUIDE TO MAGNETIC DRILLS
& ANNULAR CUTTERS
www.hougen.com
2 www.hougen.com
Magnetic Drills What is a Magnetic Drill? ........................................................................................ When Do I Use a Mag Drill? ................................................................................... Where is a Mag Drill Used? .................................................................................... Parts to a Mag Drill ................................................................................................. Which Mag Drill Do I Select? .................................................................................. Size of a Mag Drill ................................................................................................... Mag Drill Options .....................................................................................................
Annular Cutters What is an Annular Cutter? ..................................................................................... Why Use an Annular Cutter? ................................................................................... What Annular Cutter Do I Use? ............................................................................... Parts to an Annular Cutter ....................................................................................... Diameter & Depth .................................................................................................... Cutter Geometry ...................................................................................................... Standard vs. Stack-Cut Geometry ........................................................................... Non-Coated vs. Coated ........................................................................................... Types of Annular Cutters ......................................................................................... What is a Pilot? ...................................................................................................... What Makes an Annular Cutter Turn? .................................................................... Annular Cutter Accessories .................................................................................... Lubrication ..............................................................................................................
Tips & Troubleshooting Mag Drill - Magnet Adhesion ................................................................................. Mag Drill - Surface Requirements ......................................................................... How Do I Keep My Mag Drill from Slipping? ......................................................... Do I Have to Use Coolant? ................................................................................... What Causes Dull or Broken Cutters? .................................................................. Why Does My Slug Stick? ..................................................................................... Maintaining Your Mag Drill ..................................................................................... Is a Safety Strap/Chain Necessary? ..................................................................... Why is My Magnet Lifting Off the Material? .......................................................... What Should I Do After Drilling the Hole? ............................................................. What is Positive Slug Ejection? ............................................................................. What is the Proper Feed Rate for a Mag Drill? ..................................................... Why Not Use Quick Change Cutters? ................................................................... Is a Carbide Cutter Better Than a HSS Cutter? .................................................... Aren’t All Annular Cutters the Same? ................................................................... Why Do I Have Trouble Drilling Stainless Steel? ................................................... Should I Use a Power Feed Drill? ......................................................................... Can I Drill on the Same Material They are Welding? ............................................ Can I Get a Custom Cutter Made? .......................................................................
Hougen History .........................................................................................
Portable Mag Drill Chart ..................................................................
Annular Cutter Chart ...........................................................................
© 2019 Hougen Manufacturing, Inc.
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What is a Magnetic Drill?A magnetic drill is a specialized portable power tool used for drilling holes in steel and similar metals.
• They are used on the job site or in the shop • Also referred to as a mag drill, portable base drills, portable drill press
When Do I Use a Mag Drill?It can be time-consuming and cumbersome to try to maneuver large steel or pipe into position at a stationary drill press or work center. A portable magnetic drill allows you to take the drill to the work piece, instead of trying to bring the work piece to the drill.
• A portable magnetic drill may be used in any position—vertical, horizontal, or overhead (upside down)
Where is a Mag Drill Used?• Steel Fabrication• Building & Construction• Bridge Rebuilding• Mining• Ship Building• Truck, RV & Special Vehicle Build• Pipeline, Offshore & Oil Fields• Welding Shops• Power Utilities• Railroad Industries• Maintenance Facilities• Mobile Repair Shops• Machinery Riggers
Mag drills are used
everywhere from
one person shops
to large plants and
construction sites
with 1,000’s of
workers
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Parts to a Mag Drill
Magnet (Electromagnet
magnetizes to the steel)
Annular Cutter
Feed Handles
Arbor
Motor
Housing
Slide / Gibs
Front Support Bracket
The above drill is
the HMD904 which is the most popular drill
for general fabrication.
Made in USA
4
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Visit
for Video of Mag Drills in Action
Typical Control Panel
MotorOn/Off
MagnetOn/Off
Safety Switch Indicator Light
Pilot Light
Lift Detector Switch
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Which Mag Drill Do I Select?Use the chart on page 18 to determine which mag drill to use. The mag drill you select depends upon:
• Application • Diameter of hole • Depth of hole to be drilled (D.O.C. Depth of Cut) • Drilling speed requirements • Number of holes • Work environment • Space / physical limitations • Type of material to be drilled
Size of a Mag DrillAvailable in a variety of sizes. From ultra low profile to large multi-speed models.
Mag Drills can also have many options/accessories to help increase the products versatility • Coolant bottle system • Swivel base magnet • Multi-speed gear box • Power feed • Drill chucks • Pipe adapters • Countersinking • Tapping • Arbor adapters • Vac-Pad™
Short &LightweightOnly 23 lbs
Multi-speed with Large Capacity72 lbs
Made in USA
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Mag Drill Options
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What is an Annular Cutter?An annular cutter is a specialized bit for drilling through steel. Like a hole saw for wood, an annular cutter only cuts the outside edge of a hole. It produces accurate burr-free holes to close tolerances without pre-drilling or step drilling. It can drill a much larger hole and requires less force and time than a standard twist drill bit. As it turns, the cutter produces chips from the outside cutting edges and after cutting the hole a ‘slug’ (round chunk of steel from the center of the cutter) falls out.
What Annular Cutter Do I Use?Use the chart on page 19 to determine which annular cutter to use. The cutter you select depends on the diameter of the hole, the depth of cut and the type of material. A wide range of annular cutters are designed to cut through the following materials: • Carbon Steel • Stainless Steel • Aluminum
Why Use an Annular Cutter?Annular Cutters offer superior holemaking capabilities. They cut faster, last longer, produce a better hole finish, a true round hole with very tight tolerances, can be re-sharpened and drills holes with less power and torque.
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• Hard Alloys ex: Titanium• Hastelloy
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Hougen®
Annular Cutters can
be re-sharpened
multiple times. Each
time reduces the
cost of your hole.
Parts to an Annular Cutter
Shank • 3/4” dia.
• 1-1/4” dia. • Fusion2™ • Tool - less
Cutting Teeth(Different angles are
called Geometry. Does the Actual Cutting)
Flutes(Pulls chips out of hole)
Flats(Holds cutter rigid)
Hole in the top is for the pilot
Diameter & Depth
When determining the cutter size, they are measured by the depth and diameter. If you look at an actual cutter, the depth is longer than what it is rated, (a 1" cutter is really 1-1/4") because this ensures the tool can drill all the way through the hole and allows extra length for resharpening.
Made in USA
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Standard vs. Stack-Cut GeometryMost annular cutters come with Standard geometry. These cutters are designed to cut through one piece of steel. They offer the fastest, cleanest hole producing a slug that looks like a ‘Top Hat’. When the job requires drilling two or more pieces of material, cutters with stack-cut geometry must be used. The cutting teeth cut from the inside out producing a round cylinder slug.
Non-Coated vs. Coated For 80% of applications a standard HSS cutter works best. Using a coated or carbide cutter in these applications offers no additional benefit. Hard materials is where the benefit of using a coated or carbide cutter will pay off with increased tool life.
Standard Geometry Slug Stack-Cut Geometry Slug
Standard “12,000-Series” Cutter
TiN Coated“12,000-Series” Cutter
Cutter GeometryAngles on the cutting teeth make a big difference in how the tool performs. More precision angles increase the tool life and accuracy. Hougen tools have four different tooth geometries. • 2 angle • 2 & 3 angle - Hougen-Edge®
• Stack-Cut • Industrial
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Different Angles on the Teeth
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Types of Annular Cutters
“12,000-Series” M2 HSS (High Speed Steel)Most popular and used for a wide variety of applications. • Mild & Structural Steel • Aluminum • Stainless Steel (lower BHN)
“12,000-Series” M2 HSS TiN Coated Coatings offer better performance in harder steels. • Structural Steel • Stainless Steel
Copperhead™ Carbide TipCarbide provides longer tool life in harder or abrasive materials. Use a higher RPM than HSS tools for best tool life. • Corroded or Weathered Material • Structural & Stainless Steel • AR
Other Types of Annular CuttersHougen makes many different annular cutters even ones for sheet metal. Below are two styles of annular cutters for use in hand-held drills and drill presses. They offer many of the same advantages as the mag drill annular cutters such as speed, quality of hole and longer tool life.
Holcutter™RotaCut™
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What is a Pilot?
Pilots go through the center of the cutter. They retract up into the mag drill arbor as the hole is made. Pilots last a very long time and can be used with multiple sizes of cutters.
Slot allows coolant to flow to the cutting teeth
What Makes an Annular Cutter Turn?Annular Cutters are most often used with mag drills but can also be used with machine tools such as mills and large drill presses with tool holders.
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Magnetic Drills
Industrial Machines
A Pilot is a large nail looking object that must be used when using an annular cutter. It serves three very important functions: 1. Locates the center of the hole 2. Allows coolant to flow down around the slug and to the cutting teeth 3. Ejects the slug at the end of the cut
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Annular Cutter Accessories
Hole Enlarging Pilots
Machine Arbors
Chuck Arbors
Sharpening Machine
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LubricationWhenever using an annular cutter always use some type of lubrication. This will help keep the cutting tool cooler, increase tool life, allow better chip flow and provide a better hole finish. Hougen offers a variety of lubricants for use with annular cutters and for use in a variety of cutting applications.
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Mag Drill - Surface Requirements
TIPS & TROUBLESHOOTING FOR USING MAG DRILLS & ANNULAR CUTTERS
Mag Drill - Magnet AdhesionMag drills must magnetize to a solid surface. Magnetic strength is related to steel thickness. Minimum thickness is 3/8". If the material is thinner, the magnet will not hold well. Clamp another piece of steel on top or below the thinner steel for stronger adhesion. Material that is clean and free from coatings will offer the best surface for the magnet. For non-ferrous materials use a Vac-pad™ (HMD904 & HMD905 Non-swivel drills only) or clamp a piece of steel on top of it.
A clean smooth surface will allow the magnet to ‘stick’ better. Situations where the magnet will have reduced holding power... a) Material less than 3/8" thick b) Coatings or paint layers on material c) Chips, dirt, or grease between the magnet and the material d) Curved surface (Surface should be flat. For pipe applications, a pipe adapter should be used.) e) Magnet only partially on work surface
How Do I Keep My Mag Drill from Slipping?Make sure the drill’s magnetic base is clear of chips and debris and is securely attached to a clean surface. Uneven surfaces or large debris buildup prevents the magnet from obtaining optimal holding power, which can cause the drill to shift or lift during operation. A safety chain or strap also helps to prevent injury if the drill shifts. If it does shift or lift during the cut, it is very possible the cutter will break. Hougen mag drills have a built-in safety circuit that stops the motor when the drill lifts from the material. Always use a safety chain especially in horizontal & overhead positions.
VISIT WWW.HOUGEN.COM OR CALL HOUGEN TECHNICAL SERVICE 800-426-7818
READ YOUR OPERATOR’S MANUALALWAYS OBSERVE STANDARD AND SPECIFIC SAFETY INSTRUCTIONS
When in Doubt
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Do I Have to Use Coolant?No.... BUT... Coolant increases annular cutter tool life dramatically. Hougen offers a number of different kinds of lubricant depending on the application. RotaMagic™ Concentrated Cutting Fluid is a biodegradable coolant that is mixed with water and used with a mag drills coolant system. Slick-Stik™ is a waxy lubricant. The user applies a glob to the inside and cutting teeth. Slick-Stik melts as the hole is made. Good for horizontal and overhead holes. RotaFoam™ is a foamy spray lubricant that is sprayed onto the cutter before each hole. RotaGel™ is blue gel that melts and works well in all applications.
For best results use the mag drills coolant system. Spraying or squirting coolant at the cutter while it is turning does very little in helping tool life. Most of the coolant is pushed aside by the chips and flutes before it reaches the cutting teeth.
*** Note: For Hougen drills without coolant bottles... fill the coolant reservoir through the slots in the arbor. This will hold enough coolant for one hole.
The #1 cause of
cutters quickly
dulling is too little
feed pressure.
“Babying” the tool
will only decrease
tool life.
What Causes Dull or Broken Cutters?The primary cause of broken or prematurely dull cutters is a feed rate that is too slow. Slow feed rates will reduce the life of your cutter. Using a firm, steady feed pressure throughout the cut will maximize performance and extend tool life. You want to hear the drill motor working & the cutter producing long stringy chips that are being pulled from the hole. Look for a bird’s nest around the cutter. Blue Chips = Big Problem (Something obstructing the coolant system or you’re pushing too hard)
Second reason why cutters break is movement of the drill or work piece. The cutter wall can easily be snapped if the drill and material is not held rigid.
Good Looking Chips ! !
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Make sure you have the correct cutter for the material. Stack-Cut for multiple layers.
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Why Does My Slug Stick?Using lubricant or cutting fluid helps the slug to eject at the end of the cut. But whenslug ejection becomes unreliable or the steel resists cutting, it probably means thecutting edges are becoming dull. Re-sharpen or replace your cutter. Also make sure there are no chips inside your cutter which can hold up a slug.
Maintaining Your Mag DrillFor the best performance, always maintain your drill as instructed in the operator’smanual. A list of op manuals can be found at Hougen.com if the manual supplied with your drill can not be located. Many mag drills feature a slide/gib/way system that requires periodic adjustments to maintain rigidity and optimal performance. Worn or damaged parts should be replaced to reduce the possibility of injury. The mag drill should be spot checked for damage prior to use. This will prevent costly repairs from running a damaged drill.
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Is a Safety Chain / Strap Necessary?YES! Your mag drill should always be used with a safety strap or chain especially in horizontal or upside down positions. Not only for safety of the operator but protecting your investment.
T r u e S t o r y - Many many Hougen dril ls have been lost over the years from fall ing from bridges when the power cord
was unplugged. They fell into the water because they weren’t using the safety chain.
What Should I Do After Drilling the Hole?• Turn off motor• Ensure the slug has been ejected• Clean away any chips from the cutting tool & around and under the magnet
Why is My Magnet Lifting Off the Material?Check your surface as outlined in surface requirements (See Page 12). Also be sure the bottom of the magnet is free from chips and debris. A dull cutter can also push the magnet off the work surface. When drilling upside down, push on the handle closest to the arbor.
15www.hougen.com
Why Not Use Quick Change Cutters?Quick change cutters are nice and convenient if you need to change sizes every hole or two. But using a mag drill with the two set screws to hold the cutter in place offers a couple of advantages: • Holds the cutter more rigid and less opportunity for it to move and break • Will give up to 2x the tool life
Is a Carbide Cutter Better than a HSS Cutter?Not necessarily. Carbide cutters are great tools and work good on most types of materials. But where they really shine is when they are used on hard or abrasive materials. They can be used on mild and structural steel but to get the best performance, carbide tooling needs to be turned at a much higher RPM than HSS cutters.
Aren’t All Annular Cutters Pretty Much the Same?That would be like saying all meat tastes the same. Hougen was the inventor of the mag drill annular cutter technology. Hougen® Cutters include the most features for the widest range of materials and benefits for long tool life. It takes a lot of extra time to machine and quality check the tools to ensure the customer gets what they expect. When purchasing a Hougen annular cutter, you are buying the highest quality Hougen tool in the market.
What is Positive Slug Ejection?It is an arbor system that when the feed handles are retracted requires the slug to be pushed out after drilling a hole. The handles will not fully retract until the slug comes out of the cutter. Most Hougen drills include this feature. It is a much more reliable method than a spring ejection arbor.
What is the Proper Feed Rate for a Mag Drill?A solid steady feed rate should be used to maximize cutter tool life. Listen to the motor. You want the sound of the motor to bog down a little. It should sound like its working. Do not over drive or under drive it as you can break or damage the drill. Also do not “peck” at the hole... meaning... feed the cutter down then let up, then feed the cutter down and let up. This can quickly destroy your tool.
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Can I Get a Custom Cutter Made?Absolutely! Hougen can solve your holemaking problems with creative solutions to help you get the job done, complete it faster and at a lower cost. We have helped thousands of customers with unique holemaking solutions. Send us an email with your holemaking challenge or complete the custom cutter form at www.hougen.com.
Why Do I Have Trouble Drilling Stainless Steel?Stainless steel is a beautiful material but it can easily work harden. Meaning... if you pause your feed pressure even a little, the material can harden up to the point that it becomes almost impossible to continue. Use solid steady feed pressure, plenty of coolant and DO NOT let up to adjust your position.
Should I Use a Power Feed Drill?Power feed drills offer a nice option for increased productivity. Many shops set up multiple drills for one operator to run.
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HOOKS TOCOOLANTINDUCER
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For Technical Support & Warranty ServiceContact Hougen Mfg
www.hougen.com
Can I Drill on the Same Material They are Welding?No. Drilling on the same material as they are welding can cause the magnet and circuit board to short out.
North & South America810-635-7111
Australia03 5277 2611
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17www.hougen.com
• Over 400 patents worldwide• Invented spotweld cutter 1959• Patented “12,000-Series” Cutter 1973• First lightweight magnetic drill 1974• First mag drill to use annular cutters• First mag drill to drill over 1-1/2" dia.• First mag drill to drill 3" deep• First mag drill with positive slug ejection• First mag drill with safety switch• First mag drill with thru the tool coolant system• First mag drill with quill feed spindle• Quality American Made Products
Hougen Manufacturing, Inc.
Hougen Manufacturing is a family owned business with our world headquarters and manufacturing facility located in Swartz Creek Michigan. The company was started by the late Dr. E. Douglas Hougen who held over 400 worldwide patents including many for the “12,000-Series” Annular Cutter. For over 60 years Hougen has been the world leader in portable magnetic drills and annular cutters. Hougen proudly manufactures all of our magnetic drills, Hougen Cutters and most of our other products in Michigan.
Customers who demand reliability and performance from their tools choose Hougen. From engineering, to manufacturing, to customer service, Hougen produces the best product in the market. Period. With our three principles in mind “Service, Integrity, Reliability”, Hougen ensures you will be happy with our product and will work to continually solve your holemaking problems.
www.hougen.com18
PORTABLE MAGNETIC DRILLS
HMD130 HMD904 HMD905 HMD906 HMD927 HMD2MT HMD917 HMD918 HMD934
Low Profile Fabricating Heavy Duty Drilling
Cutt
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RotaLoc Plus™With
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Copperhead™ Carbide Tipped
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7/16" to 1-3/8" (12 - 35mm)
7/16" to 1-1/2" (12 - 38mm)
7/16" to 2" (12 - 50mm)
7/16" to 2" (12 - 50mm)
9/16" to 1-5/8" (14 - 41mm)
9/16" to 1-5/8" (14 - 41mm)
7/16" to 2-3/8" (12 - 60mm)
7/16" to 2-3/8" (12 - 60mm)
5/8" to 3-1/16" (16 - 77mm)
Depth Max. 1" (25mm)
2" (50mm)
2" (50mm)
2" (50mm)
2" (50mm)
2" (50mm)
3" (76mm)
6" (152mm)
4" (100mm)
Cutter Mounting BayonetStyle
3/4"Double Flat
3/4"Double Flat
3/4"Double Flat or
Fusion2™
3/4"Double Flat
3/4"Double Flat
3/4"Double Flat
3/4"Double Flat
3/4"Double Flat
No-Load R.P.M. 450 450 250 / 450 350 / 650 250 / 450 250 / 450 250 / 450 250 / 45070 / 120
200 / 332
Model Weight 23.8 lbs (10.8 kg)
28.9 lbs(13.1 kg)
35 lbs(15.9 kg)
35 lbs(15.9 kg)
43 lbs (19.5 kg)
44.2 lbs (20.1 kg)
46 lbs(20.9 kg)
44.2 lbs(20.1 kg)
72 lbs (32.6 kg)
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Pipe AdapterManual Mode
Bracket Mount
Tap AttachmentManual Mode
Vac-Pad™
Coolant Bottle Optional Included Included Included Included Included Pressurized Included
Countersink KitManual Mode
Twist Drill Adapter
Manual Mode
Ratchet Drive
Arbor ExtenderManual Mode
Drill ChuckManual Mode
RotaLoc™ Spindle Adapter
Manual Mode
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HOUGEN MANUFACTURING, INC.3001 Hougen Drive • Swartz Creek, MI 48473 USA
Ph: (810) 635-7111 • Fax: (810) [email protected] • www.hougen.com
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Australia 613 5277 2611 [email protected]
Mexico & Central America Phone: (810) 280-5615 [email protected]
Hougen Regional Sales
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